Multilevel inverters such as flying capacitor, diode clamped, and cascaded Hbridge inverters are very popular particularly in medium and high power applications. This paper focuses on a cascaded Hbridge module using a single direct current (DC) source in order to generate an 11level output voltage. The noble approach reduces the number of switches and gate drivers, in comparison with a conventional method. The anticipated topology produces more accurate result with an isolation transformer at high switching frequency. Different modulation techniques can be used for the multilevel inverter, but this work features modulation techniques known as selective harmonic elimination (SHE).This modulation approach reduces the number of carriers with reduction in Switching Losses, Total Harmonic Distortion (THD), and thereby increasing Power Quality (PQ). Based on the simulation result obtained, it appears SHE has the ability to eliminate selected harmonics by chopping off the fundamental output component. The performance evaluation of the proposed cascaded multilevel inverter is performed using PSIM simulation package and THD of 0.94% is obtained. s—Cascaded Hbridge Multilevel Inverter, Power Quality, Selective Harmonic Elimination. I. INTRODUCTION ULTILEVEL inverters are powerconversion systems composed of an array of power semiconductors switches and voltage or current sources, when properly connected and controlled, can generate waveform with variable and controlled frequency, phase, and amplitude [1]. To be called a multilevel inverter, each module phase has to produce at least minimum of three possible voltage level waveforms. A multilevel inverter has a practical approach for eliminating harmonics from the output voltage as different topologies and structures are mentioned in several literatures [2], [3]. Cascadedbridge with proper configuration can vigorously operate many needed application such as residential, industrial, renewable energy interface, and electric vehicles [4]. Conventionally, each module of the inverter bridge contains “k” direct current (DC) voltage supply for 2k+1 levels to produce desired number of output voltage level [5]. The problem of voltage unbalance that occurs in conventional multilevel inverter, for the application that required long cable and multiple DC sources, will be overcome with the proposed topology. This work focuses on an Hbridge cascaded multilevel inverter that utilized a single DC voltage source, for Gaddafi Sani Shehu, Tankut Yalcinoz, and Abdullahi Bala Kunya are with Electrical and Computer Engineering Department, Meliksah University, Kayseri, Turkey (email: gaddafisani@yahoo.ca,tyalcinoz@meliksah.edu.tr, ekunya2k5@gmail.com). its operation to enhance 11level step voltage. The topology is advantageous for high to medium power applications because it supply sinusoidal voltage at higher switching frequencies with a low switching stress, and low total harmonic distortion (THD). The multilevel inverters have several advantages as compared with 2level inverters, such as the ability to operate at high voltage with lower voltage derivative per switching, higher efficiency and low electromagnetic interference [6]. To produce multilevel sinusoidal voltage output using single DC source, the semiconductor devices are to be triggered on and off in a pattern that the fundamental voltage is produced along with the elimination of certain desired number of higher order harmonics, so that low harmonic distortion in the alternating output voltage signal and power quality (PQ) are obtained. In order to switch the semiconductor devices for the inverter purpose, proper selection and configuration of switching angles are important factors, which directly affect the size and cost of the filter if any. The solution of transcendental nonlinear equations that characterized the harmonic component at fundamental or switching frequency are obtained and are referred to as selective harmonic elimination (SHE) equations [7]. As the SHE equations are nonlinear transcendental in form, their solutions consist of simple, multiple and even no roots for a particular value of the modulation index (M), as reported in numerous journals [8], [9]. Moreover, a big task is how to get all possible solution sets, where they exist by using simple and less complex method of computation. Iterative numerical methods have been implemented to solve the SHE equation generating only one solution set, and even for this, a proper initial guess and starting value of the modulation index for which the solution are required [9]. In fact, it is difficult to predict the initial solution and the modulation index value for which solution will be found and exist. Traditional method to determine the switching angles with less complexity are proposed in [10]. When the switching pattern are obtained as required, the switching angles that will produce the lowest total harmonic distortion (THD), and power quality (PQ) in the voltage output waveform are selected for inverter switching [11]. Another important issue for the multilevel inverter is the more voltage steps, the less harmonic contents in its output. Increasing the number of steps in an inverter, not only result in additional number of components, but also result in a more complex control system of the inverter [2]. Therefore, it is a tradeoff between voltage steps and complexity of the inverter control. Gaddafi S. Shehu, T. Yalcinoz, Abdullahi B. Kunya Modelling and Simulation of Cascaded HBridge Multilevel Single Source Inverter Using PSIM M World Academy of Science, Engineering and Technology International Journal of Electrical, Computer, Energetic, Electronic and Communication Engineering Vol:8, No:5, 2014 756 International Scholarly and Scientific Research & Innovation 8(5) 2014 scholar.waset.org/1999.5/9998239 International Science Index, Energy and Power Engineering Vol:8, No:5, 2014 waset.org/Publication/9998239